Browsing by Author "Malik, P."

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Effect of boundary conditions and convection on thermally induced motion of beams subjected to internal heating
(2007) Malik, P.; Kadoli, R.; Ganesan, N.
Numerical exercises are presented on the thermally induced motion of internally heated beams under various heat transfer and structural boundary conditions. The dynamic displacement and dynamic thermal moment of the beam are analyzed taking into consideration that the temperature gradient is independent as well as dependent on the beam displacement. The effect of length to thickness ratio of the beam on the thermally induced vibration is also investigated. The type of boundary conditions has its influence on the magnitude of dynamic displacement and dynamic thermal moment. A sustained thermally induced motion is observed with progress of time when the temperature gradient being evaluated is dependent on the forced convection generated due to beam motion. A finite element method (FEM) is used to solve the structural equation of motion as well as the heat transfer equation. © Springer-Verlag 2007.
Experimental analysis of thermally induced motion of U-tubes
(2008) Malik, P.
The present article focuses attention on the effect of thermal load on dynamic response of the thin U-tubes. Experimental studies are carried out on thermally induced vibration of internally heated cantilevered U-tube. The dynamic response of the tube is studied in lateral and transverse direction for varying heating rates and frequencies. The analysis showed that the rate of vibration is governed by the heating rate and natural frequency of the tube. Lower the heating rates larger are the time to attain steady state amplitude and vice versa, there exist a threshold heating rate to produce thermal induced motion for tube. Displacement response of the U-tube in the lateral direction, during the initial period of the tube motion, occurred in the first mode and with progress of time the displacement response changed to second mode with amplitude of vibrations being lower than that observed in first mode. � Springer Science + Business Media B.V. 2008.
Experimental analysis of thermally induced motion of U-tubes
(Springer Science and Business Media, LLC, 2008) Malik, P.
The present article focuses attention on the effect of thermal load on dynamic response of the thin U-tubes. Experimental studies are carried out on thermally induced vibration of internally heated cantilevered U-tube. The dynamic response of the tube is studied in lateral and transverse direction for varying heating rates and frequencies. The analysis showed that the rate of vibration is governed by the heating rate and natural frequency of the tube. Lower the heating rates larger are the time to attain steady state amplitude and vice versa, there exist a threshold heating rate to produce thermal induced motion for tube. Displacement response of the U-tube in the lateral direction, during the initial period of the tube motion, occurred in the first mode and with progress of time the displacement response changed to second mode with amplitude of vibrations being lower than that observed in first mode. Â© Springer Science + Business Media B.V. 2008.
Nonlinear bending and free vibration response of SUS316-Al2O3 functionally graded plasma sprayed beams: theoretical and experimental study
(SAGE Publications Inc. claims@sagepub.com, 2018) Malik, P.; Kadoli, R.
Functionally graded SUS316-Al2O3 beams with ceramic content varying from 0 to 40% were prepared by a plasma spraying technique. Nonlinear finite element analysis was used to obtain the static deflection and free vibration of a clamped-free functionally graded beam. Von Kármán geometric nonlinearity and power law variation in material gradation through the beam thickness are considered in the analysis. The maximum error between the experimental and nonlinear finite element results for deflection is 6.68% and 14.31% on the fundamental frequency. Numerical results have also been attempted using ANSYS 3D solid element and they compare more closely with the experimental results. © 2016, © The Author(s) 2016.
RIVER: A Bio Inspired Routing Protocol For High Data Rate Wireless Sensor Networks
(IEEE Computer Society, 2024) Geetha, V.; Malik, P.; Sowmya Kamath, S.
Wireless sensor networks are deployed to observe the environment such as disaster management facilities and some industrial applications to observe temperature, pressure and humidity etc. The network is dynamic, battery operated and as a result it phases many issues compared to other networks like MANETs. Compared to MANETs, the issue or challenges are more as the nodes in the network has to send data to a common node called sink node. The challenges increases if the data type is other than scalar data. In future WSN gets extended to high data rate applications to sense and transmit multimedia, image or audio files. Normal routing algorithms, which are currently suitable for low data rate WSNs (LWSNs) are not sufficient for HWSNs. As a result, a new type of routing protocol which can solve various issues of HWSN is essential. It has been found that bio inspired algorithms perform very well for optimization and combinatorial problems. Bio-inspired algorithms are inspired from nature and nature has found very good solutions to very complex problems. In this regard, we are proposing and developing a new bio inspired routing protocol for high data rate wireless sensor networks called River which is based on the Intelligent Water Drops algorithm related to swarm intelligent techniques. The proposed method is implemented in ns-2, and the results are compared with AODV. The results shows on an average 75% improvement with respect to various parameters. Â© 2024 IEEE.
Thermal induced motion of functionally graded beams subjected to surface heating
(Ain Shams University, 2018) Malik, P.; Kadoli, R.
Thin beam of the functionally graded (FG) type subjected to a step heat input on one surface and insulated or exposed to convective heat loss on the opposite surface is under consideration for the evaluation of thermal induced motion. The dynamic displacement and dynamic thermal moment of the beam are analysed when the temperature gradient is independent of the beam displacement. The power law index dictates the metal–ceramic distribution across thickness of the beam and its effect on the thermal vibration of the beam is examined. The article discusses, in depth, the influence of various factors such as length to thickness ratio of beam, heat transfer boundary conditions, physical boundary conditions, and metal–ceramic combination on the thermal oscillations of FG beam. It is found that attenuation of the amplitude of static thermal deflection and superimposed thermal oscillations is a strong function of the metal–ceramic combination for the FG beam. © 2015 Faculty of Engineering, Ain Shams University
Thermo-elastic response of SUS316-Al2O3 functionally graded beams under various heat loads
(Elsevier Ltd, 2017) Malik, P.; Kadoli, R.
Geometric nonlinearity and temperature dependent material properties are accounted for in the theoretical analysis of time dependent thermo-elastic response of thin functionally graded material (FGM) SUS316-Al2O3 beam subjected to various heat loads. A two dimensional Lagrangian rectangular finite element is used to obtain the temperature distribution on the transverse plane of the beam. Nonlinear thermo-elastic deflection and thermal stresses are evaluated for various structural and thermal boundary conditions. Thermo-elastic oscillations are observed in case of beams subjected to step, concentrated line and shock heat load whereas thermo-elastic deflection is observed for beams subjected to moving heat load. As the thermal load increases, the nonlinear thermal deflection of FGM beam are higher compared to linear analysis. In general, temperature dependency of material properties influence the amplitude of thermal oscillations. High thermal stresses are induced in beams with pin-pin and clamp-pin boundary condition as compared to hinge-hinge beam. © 2017 Elsevier Ltd
Validation of Thermal and Thermo-Elastic Responses in Fixed-Free Functionally Graded Beams Under Localized Heating
(Springer Science and Business Media Deutschland GmbH, 2025) Malik, P.; Kadoli, R.
The combination of multiple constituent materials, when spatially graded, enables the creation of composite materials with tailored physical properties, making them ideal for applications in defense, aerospace, energy, and medical sectors. This study focuses on developing functionally graded materials (FGMs) with two extreme physical properties: high-temperature resistance and high strength, specifically investigating SUS316-Al2O3 beam composites. SUS316-Al2O3 beams were fabricated using the plasma spraying technique. The microstructural analysis revealed distinct gradation patterns, with plasma-sprayed beams exhibiting a layered gradation. The thermo-elastic behavior of FGM, along with pure SUS316 beams, was evaluated under thermal loads ranging from 2.925 W to 23.9 W. The SUS316-Al2O3 FGM beams displayed elastic deflection at higher thermal loads, indicating their potential for high-performance applications. A 2.23% decrease in frequency and thermal deflection of 0.6 mm was observed when the beam was heated to a temperature of 890C for about 5 min. The findings suggest that functionally graded SUS316-Al2O3 beams offer enhanced thermo-elastic properties, making them suitable for demanding applications requiring high-temperature resistance and strength. © The Society for Experimental Mechanics, Inc 2025.